Sets the number of replicas of each document in a cluster. CouchDB will
only place one replica per node in a cluster. When set up through the
Cluster Setup Wizard, a standalone single
node will have n=1, a two node cluster will have n=2, and
any larger cluster will have n=3. It is recommended not to set
n greater than 3.

Use of this option will override the n option for replica
cardinality. Use with care.

Sets the cluster-wide replica placement policy when creating new
databases. The value must be a comma-delimited list of strings of the
format zone_name:#, where zone_name is a zone as specified in
the nodes database and # is an integer indicating the number of
replicas to place on nodes with a matching zone_name.

An optional, comma-delimited list of node names that this node should
contact in order to join a cluster. If a seedlist is configured the _up
endpoint will return a 404 until the node has successfully contacted at
least one of the members of the seedlist and replicated an up-to-date copy
of the _nodes, _dbs, and _users system databases.